RIGID PIPE PROOF TESTING UNDER EXCESS OVERFILLS WITH VARYING BACKFILL PARAMETERS: SECTION II--ANALYSIS OF EXTERNAL EMBANKMENT LOADS ON THE PIPE (SOIL STRESSES)

Soil stresses due to embankment loads were measured at 10 locations about the outer periphery of the Cross Canyon, reinforced concrete culvert, in eight separate zones, subjected to varying backfill conditions. Two or three meters were placed at each location where a soil stress was to be measured to improve the accuracy of measurements. In three zones (4, 6 and 10), one of these meters was of special design to permit assessment of tangential tractions. Stressmeter readings were not, in general, indicative of pipe static equilibrium, even where tangential tractions were measured. Attempts to establish vertical equilibrium by adjustments in normal tractions, in many instances, required prohibitively large modifications, resulting in negative normal tractions. These adjustments were therefore made, rather, by synthesizing tangential tractions which (together with measured tangential tractions in Zones 4, 6 and 10) would establish static equilibrium in the vertical and rotational directions. Additional, small adjustments were made in the normal tractions to establish pipe equilibrium in the horizontal direction. This volume includes similar information concerning soil stresses in Zone 11, in the functional, prestressed concrete pipe, which was also instrumented with Cambridge Contract. Stressmeters for measurement of tangential tractions. (FHWA)

• Supplemental Notes:
  • Work described herein was performed in conjunction with the research project entitled, "Rigid Pipe Proof Testing Under Excess Overfills Using Varying Backfill Conditions," in cooperation with the Department of Transportation, Federal Highway Administration.
• Corporate Authors:

  California Department of Transportation

  Division of Structures Design, 1120 N Street
  Sacramento, CA  United States  95814
• Authors:
  • Davis, R E
  • Semans, F M
  • Spannagel, D W
  • Bacher, A E
• Publication Date: 1979-2

Media Info

• Pagination: n.p.

Subject/Index Terms

• TRT Terms: Culverts; Embankments; Loads; Measurement; Overtopping; Reinforced concrete pipe; Soils; Stress gages
• Old TRIS Terms: Overfills; Soil stress gages
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00311090
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FHWA/CA/SD-79/03 Intrm Rpt., FCP 45I2-172
• Contract Numbers: D-4-133
• Files: TRIS, STATEDOT
• Created Date: Jun 26 1980 12:00AM